Module rustc_mir_dataflow::move_paths::abs_domain
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The move-analysis portion of borrowck needs to work in an abstract
domain of lifted Places. Most of the Place variants fall into a
one-to-one mapping between the concrete and abstract (e.g., a
field-deref on a local variable, x.field, has the same meaning
in both domains). Indexed projections are the exception: a[x]
needs to be treated as mapping to the same move path as a[y] as
well as a[13], etc.
(In theory, the analysis could be extended to work with sets of
paths, so that a[0] and a[13] could be kept distinct, while
a[x] would still overlap them both. But that is not this
representation does today.)